Spring Boot

@RequestMapping Vs @GetMapping

📌 1. @RequestMapping ✅ General-purpose annotation to map any HTTP method (GET, POST, etc.) @RequestMapping(value = "/hello", method = RequestMethod.GET)public String sayHello() {    return "Hello!";} 📋 Syntax: @RequestMapping(value =...

@Controller Vs @RestController

🎭 @Controller ✅ Purpose: Used to serve web pages (like JSP/Thymeleaf/HTML) — it returns views. 📦 Common Use Case: @Controllerpublic class ViewController {    @GetMapping("/hello")    public String hello(Model model)...

🚀 What is a Spring Boot Starter?

A Spring Boot Starter is a pre-configured set of libraries that provides the functionality for a particular use case — like web apps, data access, security, etc. ✅ Starters follow the...

📦 What is MultipartFile?

MultipartFile is an interface provided by Spring to represent an uploaded file received in a multipart/form-data request. It allows you to read, store, or manipulate uploaded files in memory or...

Spring Boot REST API : Upload & Download files

📦 Tech Stack Spring Boot Spring Web (REST) Multipart support (MultipartFile) File System for storage 📁 1. Maven Dependencies (pom.xml) <dependency>    <groupId>org.springframework.boot</groupId>    <artifactId>spring-boot-starter-web</artifactId></dependency> 🛠️ 2. Controller Class –...

REST API Fallback mechanism!

Handling API calls when the client or server is down requires planning for resilience, retries, and fallback mechanisms. Here’s how to approach it: ✅ 1. Clarify Who is Down Scenario...